Detachable needle-separator.



PATENTED MAY 19, 1908. F. F-, WITKUS.

DETACHABLE NEEDLE SEPARATOR.

APPLICATION FILED MAY 22, 1907.

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or} mw- THE uomzls PETERS co., WASHINGION, 0 c4 FRANK F. WITKUS, OFMANCHESTER, NEW HAMPSHIRE.

DETACHAB LE NEEDLE-SEPARATOR.

Specification of Letters Patent.

Patented May 19, 1908.

Application filed May 22, 1907. Serial No. 375,163.

To all whom it may concern: I

Be it known that I, FRANK F. WITKUS, a subject of Nicholas II, Czar ofRussia, residing at No. 200 Wilson street, in Manchester,

in the county of Hillsborough and State of New Hampshire, have inventeda new and useful Detachable Needle-Separator as an Improvement to aTwoleedle Singer Cylinder Vamping-Machine.

My invention relates to a detachable needle separator, and particularlycontemplates the provision of an attachment for the throat plates ofsewing machines forming a part thereof and allowing for the ready andquick replacing of broken and damaged parts.

My invention further resides in forming the throat in three partsinstead of in one part as ordinarily used, and constructing said partsto interlock in an improved manner to serve all the functions of theone-piece construction.

In the accompanying drawings, forming a part of this specification, isshown the preferred embodiment of my invention, in which,

Figure 1 is a top plan view of a throat plate constructed in accordancewith my invention. Fig. 2 is a bottom plan view thereof. Fig. 3 is across section taken therethrough on the line 3-3 of Fig. 1, looking inthe direction of the arrows. Fig. 4 is a similar view taken on the line4-4 of Fig. 1, looking in the direction of the arrows. Fig. 5 is acentral, longitudinal sectional view taken therethrough. Fig. 6 is aperspective view of the slotted end of the throat plate broken away andwith the attachments removed, and Fig. 7 is a perspective view of theneedle block removed.

In the practical embodiment of my invention, I provide a throat plate 5,of conventional form, with a slotted opening 6, and with beveled inneredges 7 and curved beveled outer edges 8 at the sides of said opening 6,said inner beveled edges 7 having central projections 9 and beingadapted for the reception of a needle block 10. The needle block 10 isprovided with beveled side edges 11 and with central recesses 12 in saidedges, to conform with and interfit the edges 7 and the projections 9respectively, of the throat plate. The needle block 10 is formed of acurved plate, the curve of which is opposite to the curvature of thethroat plate 5 when assembled therewith, and said needle block isprovided with a pair of spaced needle openings 13 extending transverselytherethrough and with a separator plate 14 extending downwardlytherefrom between said openings, and slightly channeled adjacentthereto.

A locking block 15 is formed for engagement with the curved beveledouter edges 8 of the opening 6, being curved on one face correspondingto the curvature of the throat plate 5 to form an even outer surfacetherewith, and being curved on its opposite face to correspond with theconcave surface of the needle block 10 and the curvature of the edges 8.

The needle block 10 and locking block 15 when placed as shown in Figs. 3and 4, respectively engaging opposite sides of the edges of the opening6, are adapted to be locked together by a headed stud-bolt 16 countersunk within and extending through an opening in said locking block 15and threadedly engaging within an alined 0 ening 17 in the needle block10. The 100 ing block 15 is further provided with needle openings 18 toaline with the needle openings 13 of the needle block 10.

From the foregoing description, it will be apparent that I provide anovel and useful device in which the component parts may be readily andquickly locked together when desired or released to allow of theinsertion of a new part.

Having fully described my invention, I claim:

1. In a device of the character described, the combination of a throatplate, a needle block interfitting therewith, and a locking block havingmeans to detachably clamp said throat plate, said needle block anditself together, substantially as described.

2. In a device of the character described, the combination of a throatplate having a slotted opening, a needle block formed to engage thematerial of said throat plate and one face thereof adjacent saidopening, and a locking blockformed to engage the material of said throatplate on the opposite face thereof and having means to detachably clampthe said elements together, substantially as described.

3. In a device of the character described, the combination of a throatplate having a slotted opening provided with oppositely beveled edges, aneedle block formed to engage the said beveled edges adjacent one faceof said throat plate, and a locking block formed to engage the saidbeveled edges adjacent the opposite face of said throat plate and havingmeans to detachably clamp the said elements together, substantially asdescribed.

4. In a device of the character described, the combination of a throatplate, a needle block interfitting therewith, and a locking block saidelements together, said needle bloc being provided with needle openingstherethrough and having a separator plate extending therefrom betweensaid openings, substantially as described.

5. In a device of the character described, the combination of a throatplate, a needle block interfitting therewith, and a locking blockinterfitting with said throat plate on having means to detachably clamthe opposite side thereof to said needle block, and having means todetachably clamp said needle block, said needle block having needleopenings therethrough' and having a separator plate extending therefrombetween said openings, and said locking block having needle openings toaline with the said open ings of said needle block, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANK F. WVITKUS.

Witnessesf J. A. BRODERICK, IIAROLD M. RENDER.

